TWI660368B - Apparatus of pressure relief and sampling for black-sand shield bucket carrying radioactive acidic waste liquid and method thereof - Google Patents

Abstract

A pressure relief and sampling device and method for shielding a heavy sand shielding barrel with radiant acid waste liquid, which can mainly solve the technology of safe pressure relief and treatment of strong acid radioactive waste liquid, overcome the difficulties of the conventional sampling technology, and the pressure relief pipeline is designed as The main technical characteristics of the problem. The heavy sand shielding bucket can be used to remove the stored acid gas pressure in the negative pressure box and take out the waste liquid in the bucket for further processing. Because the long-stored strong acid liquid bucket contains pressure and exhaust gas, it needs to be drained to the buffer through the exhaust gas body. Drain the barrel and dilute alkali barrel to collect pressure and collect waste acid gas. Therefore, the high-activity strong acid molybdenum-99 (Molybdenum-99, Mo-99) procedure strong radioactive waste liquid used for the storage of the device of the present invention before the treatment can successfully complete the sampling of the Mo-99 radioactive strong acid inorganic waste liquid and the The exhaust gas pressure makes the subsequent processing operations reach a safer and more efficient mechanism, and is beneficial for future researchers and operators to operate safely and avoid contamination by radioactive materials, so that the process of processing radioactive inorganic waste liquid can be smoother and more efficient. Protect the safety of operators.

Description

Pressure relief and sampling device for shielding barrel with heavy acidic waste liquid containing heavy sand and method thereof

The invention relates to a pressure relief and sampling device and method for shielding a heavy sand shielding barrel with radiant acid waste liquid, and particularly relates to a technology for solving safety pressure relief and processing strong acid radioactive waste liquid, in particular, it can be used in a negative pressure tank. The heavy sand shielding barrel is drained of the acid pressure stored in the body and the waste liquid in the barrel is taken out for further processing.

Applicant-Institute of Nuclear Research established in 74 years of the Republic of China the completion of about 50 Ju (Ci) production of molybdenum-99 / 鎝 -99m (Molybdenum-99 / Technetium-99m) separation and purification program facilities, self-irradiation of natural uranium dioxide Molybdenum-99 (Mo-99) is separated and purified from the mitotic products for the nuclear seed of the nuclear medical radioactive isotope plutonium-99m (Tc-99m). The cold test, semi-heat test, hot test and full-volume hot test are gradually performed. However, in the process of making the nuclear medicine Mo-99 isotope, an inorganic radioactive waste liquid (eg, Mo-99 waste liquid) was generated and temporarily stored in a heavy sand shielded barrel containing a stainless steel lined barrel. The waste liquid contained 10N Considering the long-term storage of nitric acid solution, heavy sand shielding barrels are gradually aging and cracking, causing environmental pollution. Therefore, it is necessary to process the radioactive waste liquid in the heavy sand shielding barrel. However, the heavy sand shielding barrel has been stored for many years. The barrel contains high-pressure gas. When taking out the strong acid radioactive waste liquid, there will be the danger of sampling storm and pollute the environment. The technology that can effectively and safely release the pressure and take out the strong acid radioactive waste liquid before sampling and processing needs to be solved and overcome.

In view of the most difficult point in the treatment of Mo-99 strong acid waste liquid, the Mo-99 strong acid waste liquid is a highly concentrated nitric acid solution with strong corrosive and high activity radioactive dose. It will react with some stainless steel lined storage barrels to produce gas, so the heavy sand shielded barrel is rich in high gas pressure under long-term storage. There are two valves above the stainless steel storage barrel, one is vent valve (Vent) The other is an injection valve. If the sampling valve is used to open directly from the injection valve, it will cause a storm, resulting in personnel and environmental pollution. If the valve is opened first, the acid exhaust gas will diffuse into the space. Causes space pollution, which is a common disadvantage. It can be known that if the air pressure is not released beforehand in a safe and effective manner, when the vent valve on the shielding barrel is opened, an eruption is likely to occur, causing environmental space pollution and personnel hazards.

Therefore, how to effectively and safely release the pressure before sampling and not pollute the environment, introduce waste gas into the lye, and take out the waste liquid stably and safely for subsequent processing, avoiding the operating environment and personnel suffering from high radiation pollution, because No known technology is currently available for the disposal of old Mo-99 waste liquid drums. Therefore, general users cannot meet the needs of users in actual use. It is necessary to develop a safety pressure relief and sampling system for shielding barrels suitable for storing Mo-99 strong acid high activity radioactive waste liquid, which can be expanded Suitable for other radioactive waste liquid processing methods and devices.

The main purpose of the present invention is to overcome the above-mentioned problems encountered in the conventional art and provide a barrel of strong acid radioactive waste liquid stored for a long time with high pressure, which can effectively release the high pressure in the barrel and introduce the polluting acid waste gas into the buffer. Barrels and dilute alkali barrels, and the waste liquid in the barrel can be safely and effectively taken out for subsequent processing to ensure that the environment is not polluted during processing and is safe for operators. The protective container is equipped with a pressure relief and sampling device and a method for shielding a heavy sand shielding barrel with radiant acid waste liquid. In order to achieve the above object, the present invention is a pressure relief and sampling device for a heavy sand shielding barrel containing radiant acid waste liquid, which includes: a pressure relief pipeline, which is arranged in a negative pressure box and is connected with a heavy sand shielding barrel. Connection, one end of the pressure relief pipe is sequentially provided with a quick head, several valves, a pressure gauge, and a neutralization washing unit, and the other end is extended from the outside of the negative pressure box to be used from the weight The exhaust gas is discharged from the sand shielding barrel, and is neutralized and washed through the neutralization washing unit. The neutralization washing unit includes a buffer tank, a dilute alkali tank, and a pure water tank. The exhaust gas is sequentially stored in the tank. The buffer tank, the dilute alkali tank and the pure water tank buffer solution, dilute alkali solution and pure water are neutralized and washed; a pressure relief pipe is provided on the heavy sand shielding barrel, and the pressure relief pipe is provided with at least one One end of the valve extends into the heavy sand shielding barrel, and the other end is provided with a quick connector, which can be connected with the quick head of the pressure relief pipe; a first dust collecting filter is arranged outside the negative pressure box and It is connected to the other end of the pressure relief pipe for self-neutralization and washing of exhaust gas. Particulate removal; and a second dust collecting filter, dust collecting system connected to the first filter for the exhaust gas of the residual particles may be removed again, and is discharged outdoors.

In the above embodiment of the present invention, a sampling pipeline is further provided in the negative pressure box and connected to the heavy sand shielding barrel. One end of the sampling pipeline is provided with a fast head and a certain amount of supply unit in sequence. The other end is connected with a sampling bottle for extracting waste liquid from the heavy sand shielding barrel through the quantitative supply unit and transferring the waste liquid to the sampling bottle.

In the above embodiment of the present invention, the heavy sand shielding barrel includes a sampling tube. The sampling tube is provided with several valves and one end extends into the heavy sand shielding barrel to contact the waste liquid. The other end is provided with a quick connector. It can be connected with the quick head of the sampling pipe.

In the above embodiment of the present invention, the quantitative supply unit is a Tubing Pump.

In the above embodiment of the present invention, the first dust collecting filter is a movable high-efficiency air micro-filter. Particle filter (High Efficiency Particulate Air filter, HEPA filter).

In the above embodiment of the present invention, the second dust collecting filter is a HEPA filtering system.

The present invention further includes a pressure relief and sampling method for a heavy-duty shielded barrel containing radiant acid waste liquid, using the above-mentioned pressure relief and sampling device for a heavy-duty shielded barrel containing radiant acid waste liquid, including at least the following steps: Insertion step: Connect the quick-release heads of the pressure-relief pipe and the sampling pipe of the negative pressure box to the quick joints on the heavy sand shield barrel; the heavy sand shield barrel pressure relief step: open the pressure relief tube Valve and the valve on the pressure relief pipeline, observe the pressure displayed by the pressure gauge, so that the exhaust gas discharged from the heavy sand shielding barrel slowly flows through the buffer tank, dilute alkali tank and pure tank of the neutralization washing unit. The water tank passes through the buffer solution, dilute lye and pure water in each tank and flows into the mobile high-efficiency air particle filter after being neutralized and washed. After removing the larger particles, it is connected to the HEPA filter system for more detailed information. After filtering, it will be discharged to the outside. When the pressure of the pressure gauge returns to zero, close the valve on the pressure relief pipe and the valve on the pressure relief pipe to complete the pressure relief operation; and the sampling procedure for the heavy sand shielding barrel: open the sampling pipe Valve And start the quantitative supply unit to adjust the pump volume, observe the liquid level of the waste liquid drawn from the heavy sand shielding barrel in the sampling bottle, stop the quantitative supply unit when the liquid level reaches the required height, remove the sampling bottle to complete Operate without flushing the pipeline, and allow the remaining waste liquid at the inlet of the quantitative supply unit to flow back to the heavy sand shielding barrel. After the waste liquid has completely returned to the heavy sand shielding barrel, close the valve on the sampling tube to complete the sampling operation.

1‧‧‧ Pressure Relief Pipe

11‧‧‧fast head

12‧‧‧ the first valve

13‧‧‧Second valve

14‧‧‧Pressure gauge

15‧‧‧ neutralization washing unit

151‧‧‧buffer tank

152‧‧‧Dilute alkali tank

153‧‧‧Pure water tank

2‧‧‧ sampling pipeline

21‧‧‧fast head

22‧‧‧Quantitative supply unit

23‧‧‧sample bottle

3‧‧‧ Mobile High Efficiency Air Particle Filter

4‧‧‧HEPA filtration system

5‧‧‧ negative pressure box

6‧‧‧Heavy sand shielding bucket

61‧‧‧waste liquid

7‧‧‧ sampling tube

71‧‧‧Third valve

72‧‧‧Fourth valve

73‧‧‧Quick Coupler

8‧‧‧ Pressure Relief Pipe

81‧‧‧Fifth valve

82‧‧‧Quick Coupler

FIG. 1 is a structural diagram of the present invention.

Please refer to "Figure 1", which is a structural diagram of the present invention. As shown in the figure, the present invention is a pressure relief and sampling device for a heavy sand shielding barrel containing radiant acid waste liquid and its method. Method, the pressure relief and sampling device includes a pressure relief pipeline 1, a sampling pipeline 2, a movable high efficiency air particulate filter (HEPA filter) 3, and a HEPA filter system 4 Make up.

The pressure relief pipeline 1 mentioned above is set in a negative pressure box 5 and connected to a heavy sand shielding barrel 6. One end of the pressure relief pipeline 1 is sequentially provided with a quick head 11, a first valve 12, and a second A valve 13, a pressure gauge 14, and a neutralization washing unit 15 are used to discharge the exhaust gas from the heavy sand shielding barrel 6, and neutralize and wash through the neutralization washing unit 15, and the other end is from the negative pressure The box 5 extends outward. The neutralization and washing unit 15 includes a buffer tank 151, a dilute alkali tank 152, and a pure water tank 153. The exhaust gas is sequentially stored in the buffer tank 151, the dilute alkali tank 152, and the pure water tank 153. Neutralize and wash with buffer, dilute lye and pure water.

The sampling line 2 is arranged in the negative pressure box 5 and connected to the heavy sand shielding barrel 6. One end of the sampling line 2 is provided with a fast head 21 and a certain amount of supply unit 22 in sequence, and the other end is connected. A sampling bottle 23 is used to extract the waste liquid from the heavy sand shielding barrel 6 through the quantitative supply unit 22 and transfer the waste liquid to the sampling bottle 23. The quantitative supply unit 22 is a Tubing Pump.

The movable high-efficiency air particle filter 3 is disposed outside the negative pressure box 5 and connected to the other end of the pressure relief pipe 1 to remove particles from the neutralized and washed exhaust gas.

The HEPA filter system 4 is connected to the movable high-efficiency air particulate filter 3, and is used to remove the particles that may remain in the exhaust gas again and discharge it to the outside.

The heavy sand shielding bucket 6 is provided with a sampling pipe 7 and a pressure relief pipe 8, wherein the sampling pipe 7 is provided with a third valve 71 and a fourth valve 72, and one end of the sampling pipe 7 extends into the heavy sand shield. The barrel 6 is in contact with the waste liquid 61, and the other end is provided with a quick connector 73, which can be connected to the fast head 21 of the sampling pipeline 2. The pressure relief pipe 8 is provided with a fifth valve 81, which One end extends into the heavy sand shielding barrel 6, and the other end is provided with a quick connector 82, which can be plugged into the quick head 11 of the pressure relief pipeline 1. If so, a new pressure relief and sampling device for a shielded barrel with heavy acidic waste liquid heavy sand is formed by the disclosed structure.

During the pressure relief and sampling operation procedures of the heavy sand shielded barrel 6, the operator connects the pressure relief pipe 1 and the fast heads 11 and 21 of the sampling pipeline 2 extending in the negative pressure box 5 to the heavy sand shielded barrel. The quick connectors 82 and 73 on 6 are shown in the first figure.

When depressurizing the heavy sand shielding barrel 6, first confirm that the quick head 11 of the pressure relief pipe 1 and the quick connector 82 of the pressure relief pipe 8 have been properly connected, and the fifth valve 81, the first valve 12 and The second valves 13 are all closed tightly. Next, first open the fifth valve 81 and then slowly open the first valve 12, observe the pressure displayed by the pressure gauge 14 and record it. Then, depending on the pressure, slowly open the second valve 13 to allow the exhaust gas discharged from the heavy sand shielding barrel 6 to slowly flow through the buffer tank 151 (for example: 5000cc), the dilute alkali tank 152 (for example : 5000cc) and the pure water tank 153 (for example: 5000cc), after flowing into the movable high-efficiency air particulate filter 3 after neutralization and washing, the larger particles are removed and then connected to the HEPA filter system 4 for finer details It is filtered and then discharged outdoors. Finally, when the pressure of the pressure gauge 14 returns to zero, the fifth valve 81, the first valve 12 and the second valve 13 are closed to complete the pressure relief operation.

When sampling the heavy sand shielding bucket 6, first confirm that the fast head 21 of the sampling pipe 2 and the fast joint 73 of the sampling pipe 7 are properly connected, and the third valve 71 and the fourth valve 72 are tightly closed. of. Next, first open the third valve 71 and the fourth valve 72 and then start the quantitative supply unit 22 (ie, the peristaltic pump), and adjust the pump volume. Then observe the liquid level of the waste liquid 61 in the sampling bottle 23 (for example: 100ml). When the liquid level reaches the required height, stop the quantitative supply unit 22, take out the sampling bottle 23 to complete the operation, and do not flush the pipeline. The remaining waste liquid 61 at the inlet of the quantitative supply unit 22 flows back to the heavy sand Shield bucket 6. Finally, when the waste liquid 61 has completely returned to the heavy sand shielding bucket 6, the third valve 71 and the fourth valve 72 are closed to complete the sampling operation.

The pressure-releasing and sampling device and method for shielding heavy-sand barrels containing radiant acidic waste liquids provided by the present invention can mainly solve the technology of safe pressure-releasing and treating strong acid radioactive waste liquids, and overcome the difficulties of the conventional sampling technology, and relieve the pressure. Piping design is the main technical feature to solve the problem. The heavy sand shielding bucket can be used to remove the stored acid gas pressure in the negative pressure box and take out the waste liquid in the bucket for further processing. Because the long-stored strong acid liquid bucket contains pressure and exhaust gas, it needs to be drained to the buffer through the exhaust gas body. Drain the barrel and dilute alkali barrel to collect pressure and collect waste acid gas. Therefore, the high-activity strong acid molybdenum-99 (Molybdenum-99, Mo-99) procedure strong radioactive waste liquid used for the storage of the device of the present invention before processing can successfully complete the sampling of Mo-99 radioactive strong acid inorganic waste liquid The exhaust gas pressure makes the subsequent processing operations reach a safer and more efficient mechanism, and is beneficial for future researchers and operators to operate safely and avoid contamination by radioactive materials, so that the process of processing radioactive inorganic waste liquid can be smoother and more efficient. Protect the safety of operators.

In summary, the present invention is a pressure relief and sampling device and method for shielding heavy sand shielding barrels with radiant acid waste liquid, which can effectively alleviate various shortcomings in practice, and store strong acid radioactive waste liquid barrels that have been stored for a long time. It can effectively release the high pressure in the barrel, introduce the contaminated acid waste gas into the buffer barrel and the dilute alkali barrel, and safely and effectively remove the waste liquid in the barrel for subsequent processing, ensuring that the environment is not polluted during the processing and the operator Radiation protection, so that the production of the present invention can be more advanced, more practical, and more in line with the needs of users, it has indeed met the requirements for invention patent applications, and filed a patent application according to law.

However, the above are only the preferred embodiments of the present invention, and the scope of implementation of the present invention cannot be limited by this; therefore, any simple equivalent changes and modifications made in accordance with the scope of the patent application and the contents of the invention specification of the present invention , All should still fall within the scope of the invention patent.

Claims (5)

A pressure relief and sampling device for a heavy sand shield barrel containing radiant acid waste liquid, which comprises: a pressure relief pipeline, which is arranged in a negative pressure box and connected to a heavy sand shield barrel. One end of the pressure relief pipeline is A quick head, several valves, a pressure gauge, and a neutralization washing unit are provided in order to discharge the exhaust gas from the heavy sand shielding barrel, and the neutralization and washing unit is used for neutralization and washing, and the other end is Extending from the outside of the negative pressure tank, the neutralization washing unit includes a buffer tank, a dilute alkali tank and a pure water tank, and the exhaust gas is sequentially stored in the buffer tank, the dilute alkali tank and Neutralization and washing of buffer solution, dilute alkali solution and pure water in the pure water tank; a sampling line is provided in the negative pressure box and connected to the heavy sand shielding barrel, and one end of the sampling line is sequentially arranged There is a fast head and a certain amount of supply unit, and the other end is connected to a sampling bottle for extracting waste liquid from the heavy sand shielding barrel through the quantitative supply unit and transferring it to the sampling bottle; a sampling tube is provided in the On a heavy sand shielded barrel, the sampling tube is provided with several valves, the One end extends into the heavy sand shielding barrel to contact the waste liquid, and the other end is provided with a quick connector, which can be connected to the fast head of the sampling pipeline; a pressure relief pipe is provided on the heavy sand shielding barrel, and the drain The pressure pipe is provided with at least one valve, one end of which is inserted into the heavy sand shielding barrel, and the other end is provided with a quick connector, which can be connected with the quick head of the pressure relief pipe; a first dust collecting filter, which is arranged on the The negative pressure box is connected to the other end of the pressure relief pipe to remove particles from the neutralized and washed exhaust gas; and a second dust collection filter is connected to the first dust collection filter Connected to remove any particles that may remain in the exhaust gas and discharge it outdoors. According to the pressure relief and sampling device for a shielding barrel with heavy acidic waste liquid heavy sand as described in item 1 of the scope of the patent application, the quantitative supply unit is a Tubing Pump. The pressure relief and sampling device for shielding heavy-duty shielding barrels containing radiant acid waste liquid as described in item 1 of the scope of the patent application, wherein the first dust collection filter is a high efficiency air particulate filter (High Efficiency Particulate Air filter, HEPA filter). According to the pressure relief and sampling device for shielding barrels with heavy acidic waste liquid heavy sand as described in item 1 of the scope of patent application, the second dust collection filter is a HEPA filter system. Pressure relief and sampling method for shielding barrel with heavy acid waste liquid containing heavy acid sand, using pressure relief and sampling device for shielding bucket with heavy acid waste liquid containing heavy acid as described in any one of claims 1 to 4 , Which includes at least the following steps: pipeline plugging step: connecting the quick-release head of the pressure-relief pipe and the sampling pipe extended in the negative pressure box to each quick connector on the heavy sand shielding barrel; Pressure step: open the valve on the pressure relief pipe and the valve on the pressure relief pipe, observe the pressure displayed by the pressure gauge, and let the exhaust gas discharged from the heavy sand shielding barrel flow slowly through the neutralization washing unit The buffer tank, dilute alkali tank and pure water tank, after being neutralized and washed in the buffer solution, dilute alkali solution and pure water in each tank, and then flow into the movable high-efficiency air particulate filter as the first dust collecting filter. After removing the larger particles, it is connected to the HEPA filter system as the second dust filter for finer filtration and then discharged to the outside. When the pressure of the pressure gauge returns to zero, close the valve on the pressure relief pipe and the Valve on pressure relief line, finished Pressure relief operation; and heavy sand shielding barrel sampling steps: open the valve on the sampling tube and start the quantitative supply unit to adjust the pump volume, and observe the liquid level of the waste liquid drawn from the heavy sand shielding barrel in the sampling bottle. When the liquid level reaches the required height, stop the quantitative supply unit, take out the sampling bottle to complete the operation, and do not flush the pipeline, and let the remaining waste liquid at the inlet of the quantitative supply unit flow back to the heavy sand shielding barrel. When the waste liquid completely flows back After the heavy sand shielding barrel, close the valve on the sampling tube to complete the sampling operation.